Quoted from Ron in another thread:
OK, here we go
http://www.m17n.org/linux-sh/dreamcast/
Linux on Dreamcast
A Beginners Guide
http://www.fivemouse.com/dclinux.html
http://www.linuxdevices.com/articles/AT7466555948.html
and http://linuxdc.sourceforge.net/
For NetBSD just use the search in the page, a lot of info is compiled about.
http://www.netbsd.org
With this you wouldn't have any problem approaching to Linux in Dreamcast.
Good Luck
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